Out of the dark shadows comes the Nightmare burr, a spine-tingling design from the mind of Alfons Eyckmans. This is one of the few "Haaks burrs" or "perpendicular burrs" that Alfons has designed. Among these designs are: Chaos (level 11) and Mayhem (level 23). The "Haaks burrs" can be rather confusing because of the strange "broken" burr pieces that construct it. Burrs of this kind behave in bizarre ways and can move and shift when the puzzler does not expect it to.
The coloration of the puzzle is for decoration only and doubles as a means to further confuse the puzzler during reconstruction. This puzzle may keep you up at night.